| 摘要 |
PURPOSE: A continuously variable automatic transmission oil-hydraulic circuit is provided to change gear into high gear and low gear by operating a shift lever and to improve safety of a vehicle. CONSTITUTION: A manual valve(5) is operated by shift lever operation of an operator. The manual valve forms D-pressure and L-pressure. A direct control solenoid valve(7) directly forms clutch control pressure by receiving clutch pressure. The clutch control pressure controls a clutch for a high gear and a brake for a low gear. The direct control solenoid valve supplies the clutch control pressure to the manual valve. A switch valve receives brake control pressure to the brake for the low gear when any of idler pulley control pressure, driving pulley control pressure, and the L-pressure is not operated.
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